agent

Definition of the noun agent


1. (21) agent : an active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents"
2. (6) agent : a substance that exerts some force or effect
3. (6) agent : a representative who acts on behalf of other persons or organizations
4. (1) agent, factor, broker : a businessman who buys or sells for another in exchange for a commission
5. agent, federal agent : any agent or representative of a federal agency or bureau
6. agentive role, agent : the semantic role of the animate entity that instigates or causes the hapening denoted by the verb in the clause